A serger that threaded itself would be awesome! I have a older Bernina serger that adjusts the tensions really easily. All I have to do is set the dial and it adjusts. I really like that and that's why I bought it. I do quite a bit of garment sewing, home dec, etc. so a serger is really helpful. I don't know how much the new Berninas are but I'm guessing they would be much more than $500 - $600.